scope:

This Outline of Investigation covers requirements for
Audio/Video, Information and Communication Technology Equipment
Cabinet, Enclosure and Rack Systems. For the purpose of this
Outline, cabinet, enclosure and rack systems are all referred to as
"enclosure systems".

Enclosure systems are not complete equipment but include
components and sub-assemblies that are intended to power, protect,
heat, cool or otherwise support information technology (IT),
telecommunications, audio/video (A/V) and similar equipment that
will be installed at a later time. They usually include mounting
hardware, shelves or space for the installation of the additional
equipment. These enclosure systems are intended to be used by
manufacturers in the construction of complete A/V, IT and
communications equipment, or by service providers and other
qualified installers for the installation of network infrastructure
equipment or communications and multi-media systems equipment.

This Outline of Investigation assumes that the final
installation of equipment into the enclosure system will be
performed by qualified service personnel in accordance with the
applicable installation instructions, installation practices and
national installation codes. As appropriate, this equipment should
be installed in accordance with ANSI/NFPA 70, National Electrical
Code (NEC), and/or the applicable sections of ANSI/IEEE C2,
National Electrical Safety Code (NESC). Equipment intended for
installation in information technology equipment (computer) rooms
should be installed in accordance with NFPA 75, Standard for the
Protection of Information Technology Equipment.

Enclosure systems by their very nature are intended to house
equipment that is not specified by the enclosure system
manufacturer and whose construction and characteristics are largely
unknown. As such, in some cases these requirements include
additional or supplementary safeguards beyond those normally
required by general equipment standards where the final
configuration is well defined and risks can be reduced to an
acceptable level by a thorough evaluation of the design and
testing.

These requirements do not cover enclosures for modular data
centers. Equipment of this type shall be investigated under the
requirements in the Outline of Investigation for Modular Data
Centers, UL 2755.

These requirements do not cover exhaust chimneys and other air
management systems that connect to environmental air systems in
buildings. Equipment of this type shall be investigated under the
requirements in Standard for Heating and Cooling Equipment, UL
1995, and Outline of Investigation for Drop Out Ceilings Installed
Beneath Sprinklers, UL 723S.

Note: Environmental air systems include ducts specifically
designed for environmental air and other spaces used for
environmental air (plenums) that may not be specifically fabricated
for environmental air-handling purposes but are used for
air-handling purposes as a plenum. The space over a hung ceiling
used for environmental air-handling purposes is an example of this
type of other space.

It is the responsibility of the Authority Having Jurisdiction
over the final installation to determine if the final configuration
meets the necessary criteria for installation and use.